The ".*" means that this settings are the default ones
(see below), valid values for the first element of the
following lists are signature, signature-file,
organization, address, name or body. The attribute name
can also be a string. In that case, this will be used as
a header name, and the value will be inserted in the
headers of the article; if the value is nil, the header
name will be removed. You can also say (eval (foo bar)),
then the function foo will be evaluated with argument bar
and the result will be thrown away.